Doctor Who: The Silent Stars Go By

For centuries the Maintainers have worked. With no help from other worlds, they subsist on the food they can grow and thats little enough. But their purpose, their whole life is to maintain the machines that will one day make their world as habitable as old Earth. Life used to be hard. Now as their crops fail, livestock sickens, and the temperature drops, its becoming impossible. This years Winter Season Feast wont be the usual celebration. Its not a time for optimism or hope - and its not a time to welcome unexpected guests. The Doctor, Amy, and Rory find a society breaking apart under the strain. Tensions are mounting, old rivalries are coming to the fore, people are dying...and then the Doctors old enemies, the Ice Warriors, make their move. With the cold-hearted threat of invasion, the real battle for survival begins. Or does it? The Doctor begins to suspect that behind everything lies a deadlier, and even more chilling danger...